External acceleration system for biological denitrification process during wastewater treatment

Abstract

Disclosed is an external acceleration system for a biological denitrification process during wastewater treatment, including a biological denitrification mechanism, a denitrification acceleration mechanism, and a water circulation mechanism, where the biological denitrification mechanism includes a biological denitrification tank, a three-way valve, a wastewater assembly, and a water inlet pipe; the denitrification acceleration mechanism includes a denitrification accelerator and an assembly for enhancing the sulfur disproportionation reaction; the water circulation mechanism includes a first water delivery pump, a first water delivery pipe, a second water delivery pipe, and a second water delivery pump. The external acceleration system for a biological denitrification process during wastewater treatment spatially and temporally separates the sulfur disproportionation reaction process from the biological denitrification process so that the two processes do not interfere with each other and mutually promote the denitrification effect, which is beneficial to ensure the high efficiency and stability of the denitrification effect. The independently provided denitrification accelerator releases the coupling of the sulfur disproportionation reaction and the autotrophic denitrification reaction in the related art and has a high adaptability to various denitrification systems.

We claim: 
     
         1 . An external acceleration system for a biological denitrification process during wastewater treatment, comprising a biological denitrification mechanism ( 1 ), a denitrification acceleration mechanism ( 2 ), and a water circulation mechanism ( 3 ), wherein the biological denitrification mechanism ( 1 ) comprises a biological denitrification tank ( 11 ), a three-way valve ( 13 ), a wastewater assembly ( 14 ), and a water inlet pipe ( 15 ); the denitrification acceleration mechanism ( 2 ) comprises a denitrification accelerator ( 21 ) and an assembly for enhancing the sulfur disproportionation reaction; the water circulation mechanism ( 3 ) comprises a first water delivery pump ( 31 ), a first water delivery pipe ( 32 ), a second water delivery pipe ( 33 ), and a second water delivery pump ( 34 ); a water inlet of the first water delivery pipe ( 32 ) is connected to the biological denitrification tank ( 11 ), and a water outlet of the first water delivery pipe ( 32 ) is connected to the denitrification accelerator ( 21 ); the first water delivery pump ( 31 ) is connected to the first water delivery pipe ( 32 ), and the first water delivery pipe ( 32 ) is mounted with a first stop valve ( 321 ); a water inlet of the second water delivery pipe ( 33 ) is connected to the denitrification accelerator ( 21 ), and a water outlet of the second water delivery pipe ( 33 ) is connected to a second water inlet of the three-way valve ( 13 ); a first water inlet of the three-way valve ( 13 ) is connected to a water outlet of the wastewater assembly ( 14 ); a water outlet of the three-way valve ( 13 ) is connected to a water inlet of the water inlet pipe ( 15 ), and a water outlet of the water inlet pipe ( 15 ) is connected to the biological denitrification tank ( 11 ); the second water delivery pump ( 34 ) is connected to the second water delivery pipe ( 33 ), and the second water delivery pipe ( 33 ) is mounted with a second stop valve ( 331 ); the assembly for enhancing the sulfur disproportionation reaction is mounted on the denitrification accelerator ( 21 ) or the first water delivery pipe ( 32 ). 
     
     
         2 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the denitrification accelerator ( 21 ) is inoculated with sulfur-disproportionating bacteria, the denitrification accelerator ( 21 ) is filled with a sulfur-based filler ( 25 ), and the biological denitrification tank ( 11 ) is filled with a biological denitrification filler ( 16 ). 
     
     
         3 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the sulfur-disproportionating bacteria are microorganisms that use the intermediate-valence sulfur-containing compound or zero-valence sulfur to perform an autotrophic disproportionation reaction and generate sulfate and sulfide at the same time. 
     
     
         4 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the wastewater assembly ( 14 ) comprises a wastewater pipe ( 141 ) and a wastewater pump ( 142 ); a water inlet of the wastewater pipe ( 141 ) is connected to a wastewater tank, and a water outlet of the wastewater pipe ( 141 ) is connected to the first water inlet of the three-way valve ( 13 ); the wastewater pump ( 142 ) is connected to the wastewater pipe ( 141 ). 
     
     
         5 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the biological denitrification tank ( 11 ) is mounted with a water outlet pipe ( 12 ); a water inlet of the water outlet pipe ( 12 ) is connected to the biological denitrification tank ( 11 ), and a water outlet of the water outlet pipe ( 12 ) is connected to an external clean water tank; the water outlet pipe ( 12 ) is mounted with a water outlet stop valve ( 121 ). 
     
     
         6 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the biological denitrification tank ( 11 ) is arranged with an exhaust port ( 17 ). 
     
     
         7 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the assembly for enhancing the sulfur disproportionation reaction comprises a pH online monitor ( 22 ) and an automatic lye dripping device ( 23 ). 
     
     
         8 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the water circulation mechanism ( 3 ) comprises a NO 3   −  online monitor ( 36 ), and the NO 3   −  online monitor ( 36 ) is mounted in the biological denitrification tank ( 11 ). 
     
     
         9 . The external acceleration system for a biological denitrification process during wastewater treatment according to  claim 1 , wherein the water circulation mechanism ( 3 ) further comprises a circulation control part ( 35 ); a first signal input end of the circulation control part ( 35 ) is connected to a NO 3   −  online monitor ( 36 ), and a second signal input end of the circulation control part ( 35 ) is connected to a pH online monitor ( 22 ); a first signal output end of the circulation control part ( 35 ) is connected to an automatic lye dripping device ( 23 ), and a second signal output end of the circulation control part ( 35 ) is connected to the first stop valve ( 321 ) and the second stop valve ( 331 ).